1. This puzzle's theme, in a way
5. Cardiff natives
10. Fitness centers
14. Haus wife?
15. The Gem State
16. Comrade in arms
17. Frank
19. Anagram of "nail"
20. Marine hazards
21. Thespian's job
23. Word preceding a sentence?
25. Nada
26. Miss-named?
27. Canal site
28. Fondle
30. "___ be an honor."
31. "Clue" professor
33. Turn red or yellow, say
36. Tops off
39. Is for more than one
40. Swedish bread?
41. Very, in music
42. Radial, e.g.
44. Mary ___ cosmetics
45. Urban renewal target
47. Gentlemen's gentlemen
50. PC "brain"
52. Churchill's gesture
53. Calm
54. Motivated
56. Jeweler's unit
57. Santa ___, Calif.
58. Frank
63. Harbinger
64. Bumps
65. Pet peeve?
66. Method
67. A goner, so to speak
68. Drop a line?